<div id="app">
    {{message}}

    <!-- 在 "change" 而不是 "input" 事件中更新 -->
    <input v-model.lazy="msg">
</div>
<script src="js/vue.js"></script>
<script>
    const app = new Vue({
        el: "#app",
        data: {
            message: "你好啊"
        },
        methods: {}
    })
</script>